Reddit reviews Grade 2 Titanium Round Rod, Unpolished (Mill) Finish, Annealed, Standard Tolerance, Inch, ASTM B348/ASME SB-348
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Grade 2 titanium is stronger than grade 1 titanium, and provides a balance of weldability, formability, and corrosion resistanceMeets ASTM B348 and ASME SB-348 specificationsUnpolished (mill) surface has no finishAnnealed after shaping to modify the metal's propertiesStandard tolerance
This will tell you a bit more about grades, but titanium itself isn't reactive to the human body (no one has ti allergies). Unless you need the strength of the alloyed medical grade stuff, sticking to grades 1-3 will be a lot cheaper and a ton easier to work with.
Edit: When I've got to pick up just a little at a time, Amazon supply is pretty great for raw materials. They've got grade 2 ti that's close to 8 gauge, but I haven't found anything smaller than that for a fair price yet.
Edit 2: 18 Gauge ti wire per foot
Edit 3: Turns out people are allergic to ti after all, unfortunately the alloyed versions aren't going to help much. They're surgical grade because they don't contain vanadium (which is used in grade 5, the most common titanium you'll find), which is toxic to humans on it's own. If someone has skin allergies from titanium, then any grade is going to cause issues.